Corkscrew



FIG. 1 is a top, front, left side perspective view of a corkscrewshowing my new design;

FIG. 2 is a top, rear, right side perspective view thereof;

FIG. 3 is a perspective view thereof, shown in an open position; and,

FIG. 4 is a bottom plan view thereof.

The ornamental design for a corkscrew, as shown and described.